Figure 7-45.Four 115-volt coil connected in parallel for 230 volts; each coil still receives only 115 volts.supply. Each coil receives 115 volts. If the four coilswere connected in two parallel sets of coils to a 230-voltline, as shown in figure 7-45, each coil would stillreceive 115 volts. So, regardless of the line voltage, thecoil voltage is the same. This is the principle used in alldual-voltage machines. Therefore, if four leads arebrought out of a single-phase motor designed for460/230 or 230/115-volt operation, the motor can bereadily connected for either voltage.Dual-Voltage Wye MotorWhen you are connecting a dual-voltage wyemotor, remember practically all three-phase dual-Figure 7-46.Terminal markings and connection for a wye-connected dual-voltage motor.voltage motors have nine leads brought out of the motorfrom the winding. These are marked TI through T9, sothat they may be connected externally for either of thetwo voltages. These are standard terminal markings andare shown in figure 7-46 for wye-connected motors.HIGH VOLTAGE.to connect for high voltage,you should connect groups in series, as shown in figure7-47. Use the following procedure:1. Connect T6 and T9; twist and wire nut.2. Connect leads T4 and T7; twist and wire nut.3. Connect T5 and T8; twist and wire nut.4. Connect leads TI, T2, and T3 to the three-phaseline.LOW VOLTAGE.This same motor can beconnected for low voltage. Use the followingprocedure:Figure 7-47.Two-voltage wye motor windings connected inserifs for high-voltage operations.7-37